<template>
  <div class="login-container">
    <!-- elementUI表单结构
      el-form > el-form-item > 具体的表单标签(输入框/复选框/....)
      做表单的校验:
      方式1: 标签上校验(失去焦点校验)
      el-form标签: :model="表单数据对象" :rules="规则对象"
      el-form-item prop="对象里key名"
      具体标签 v-model="表单数据对象.key名"
      重要: 因为组件内要访问key名, 所以要求表单数据对象和规则对象key必须一致
      prop和v-model的那个key名对应的

      方式2: JS里兜底校验(防止用户上来直接点击按钮-想跳过标签校验)
      el-form标签: ref="别名" 为了在js中this.$refs.别名 获取到el-form组件对象
      点击登录事件方法内, 调用组件对象内置.validate()方法进行强制校验
     -->
    <el-form
      ref="loginForm"
      :model="loginForm"
      :rules="loginRules"
      class="login-form"
      auto-complete="on"
      label-position="left"
    >
      <div class="title-container">
        <h3 class="title">
          <img src="@/assets/common/login-logo.png" alt="" />
        </h3>
      </div>

      <el-form-item prop="mobile">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input
          ref="mobile"
          v-model="loginForm.mobile"
          placeholder="Mobile"
          name="mobile"
          type="text"
          tabindex="1"
          auto-complete="on"
        />
      </el-form-item>

      <el-form-item prop="password">
        <span class="svg-container">
          <svg-icon icon-class="password" />
        </span>
        <el-input
          :key="passwordType"
          ref="password"
          v-model="loginForm.password"
          :type="passwordType"
          placeholder="Password"
          name="password"
          tabindex="2"
          auto-complete="on"
          @keyup.enter.native="handleLogin"
        />
        <span class="show-pwd" @click="showPwd">
          <svg-icon
            :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'"
          />
        </span>
      </el-form-item>

      <el-button
        :loading="loading"
        type="primary"
        style="width:100%;margin-bottom:30px;"
        @click.native.prevent="handleLogin"
        class="login_btn"
        >登录</el-button
      >

      <div class="tips">
        <span style="margin-right:20px;">手机号: 13800000002</span>
        <span> 密码: 123456</span>
      </div>
      <div>
        <button @click.prevent="testFn">测试</button>
      </div>
    </el-form>
  </div>
</template>

<script>
import { validMobile } from '@/utils/validate'
import { getUserProfileAPI } from '@/api'

export default {
  name: 'Login',
  data () {
    const validateMobile = (rule, value, callback) => {
      if (!validMobile(value)) {
        callback(new Error('请输入正确的手机号'))
      } else {
        callback()
      }
    }
    return {
      loginForm: {
        mobile: '13800000002',
        password: '123456'
      },
      loginRules: {
        mobile: [
          { required: true, trigger: 'blur', validator: validateMobile }
        ],
        password: [
          {
            required: true,
            trigger: 'blur',
            min: 6,
            max: 16,
            message: '密码长度在6-16位之间'
          }
        ]
      },
      loading: false,
      passwordType: 'password',
      redirect: undefined
    }
  },
  watch: {
    // 侦听路由对象的变化(页面跳转到这里, 就会触发下面handler函数)
    $route: {
      handler: function (route) {
        // 看看上一个页面是否传递了redirect过来 (登陆返回未遂地址)
        this.redirect = route.query && route.query.redirect
      },
      immediate: true
    }
  },
  methods: {
    showPwd () {
      if (this.passwordType === 'password') {
        this.passwordType = ''
      } else {
        this.passwordType = 'password'
      }
      this.$nextTick(() => {
        this.$refs.password.focus()
      })
    },
    handleLogin () {
      this.$refs.loginForm.validate(async valid => {
        if (valid) {
          // 通过发起登录请求
          // await 只能提取Promise对象的状态的值
          // await 取代then()函数的, await可以把成功的值提取出来留在原地
          // 如何捕获promise错误的状态,使用try+catch代码块
          try {
            // 放入可能报错的代码,
            // 坑,不加await,会调用登录接口的时候,这个登录异步任务无结果的时候
            // 代码会往下走,就跳转进去了(问题:密码错误也能跳转)
            const res = await this.$store.dispatch(
              'user/loginActions',
              this.loginForm
            ) // await等后面成功了,才会继续往下走
            this.$message.success(res.message)
            this.$router.replace('/')
            // console.log(res.data)
          } catch (err) {
            // 一旦try大括号内代码报错立刻停止try大括号下面里代码向下执行
            // 转而直接跳转catch大括号里执行,err形参接受的就是错误对象
            // 错误对象要用console.dir打印
            console.dir(err)
          }
        }
      })
    },
    async testFn () {
      const res = await getUserProfileAPI()
      console.log(res)
    }
  }
}
</script>

<style lang="scss">
.login_btn {
  background: #407ffe;
  height: 64px;
  line-height: 32px;
  font-size: 24px;
}
/* 修复input 背景不协调 和光标变色 */
/* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */

$bg: #283443;
$light_gray: #68b0fe;
$cursor: #68b0fe;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
  .login-container .el-input input {
    color: $cursor;
  }
}

/* reset element-ui css */
.login-container {
  background-image: url('~@/assets/common/login.jpg'); // 设置背景图片
  background-position: center; // 将图片位置设置为充满整个屏幕
  .el-input {
    display: inline-block;
    height: 47px;
    width: 85%;

    input {
      background: transparent;
      border: 0px;
      -webkit-appearance: none;
      border-radius: 0px;
      padding: 12px 5px 12px 15px;
      color: $light_gray;
      height: 47px;
      caret-color: $cursor;

      &:-webkit-autofill {
        box-shadow: 0 0 0px 1000px $bg inset !important;
        -webkit-text-fill-color: $cursor !important;
      }
    }
  }

  .el-form-item {
    border: 1px solid rgba(255, 255, 255, 0.1);
    // background: rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.7);
    border-radius: 5px;
    color: #454545;
  }
}
.el-form-item__error {
  font-size: 14px;
}
</style>

<style lang="scss" scoped>
$bg: #2d3a4b;
$dark_gray: #889aa4;
$light_gray: #eee;

.login-container {
  min-height: 100%;
  width: 100%;
  background-color: $bg;
  overflow: hidden;

  .login-form {
    position: relative;
    width: 520px;
    max-width: 100%;
    padding: 160px 35px 0;
    margin: 0 auto;
    overflow: hidden;
  }

  .tips {
    font-size: 14px;
    color: #fff;
    margin-bottom: 10px;

    span {
      &:first-of-type {
        margin-right: 16px;
      }
    }
  }

  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
    position: relative;

    .title {
      font-size: 26px;
      color: $light_gray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }
}
</style>
